Control means for fluid power transmitters



Jan.16, 1940. H. F. CANAAN 2,136,956

CONTROL MEANS FOR FLUID POWER TRANSMITTERS 2 Sheets-Sheet- 1 Jame, 1940.

H. F. CANAAN CONTROL MEANS FOR FLUID POWER TRANSMITTERS 2 Sheet-Sheet 2 Filed Oct. 26, 1936 Patented Jan. 16, Y

UNlTED STATES PATE I 2,186,956 coN'moL MEANS FOR.

NT oFF cE I nmnrownn I TRANSMITTERS Hans Faic Canaan, Heidenheim-on-the-Brenz,

Germany, assignor to J. M. Voith, Heidenheimon-the-Brenz, Germany, composed of Walther Voith, H

and Hanns Voith Application ing pump, this pump is merely stopped to effect emptying, and the working circuit exhausts through the gap between the vane wheels or through small ports at the periphery, under the action of centrifugal force. In other cases again, a closable port was provided at the periphery of the rotating part of the transmitter in the neighborhood 'of its maximum diameter and leading directly from the working chamber into the open, especially for the purpose of obtaining automatic and accelerated emptying. These devices have, however, the objection that relatively heavy parts, guided in suitable guides, are necessary for controlling the emptying ports Firstly, owing to the radially acting centrifugal force, additional pressure is needed to keepthe stopvalve parts'shut, since these tend to move outwards by reason of their mass. Further, there is the risk that these stop-valve parts, which are guided in guides, will seize with the slightest fouling produced by the working'fluid and thus adversely affect the efl'ectiveness of, the emptying device and in consequence interferewith the operation of the whole fluid transmitter.

The. present invention has, in comparison with theseknown arrangements, the great advantage that sealing elements are used which, while without guides, enable the peripheral emptying ports to be absolutely sealed, even if there is dirt in the working fluid. Seizing oi the sealing elements is completely eliminated bytheomission of any guides. The sea ng elements are almost without mass, on which account the undesirable effect of centrifugal force cannot occur. The shut-oil members, which are preferably of thin iron or other metal,'leatherjindia-rubber, or other flexible "material, therefore do not require the high pressure necessary in previously known .ar-, rangements for keeping them closedwhile the,

power, transmitter is full and running. The emptying ports, with their associated shut-ofl members, of which a plurality are provided for to permit the working to keep the cira copartnership rmann Voith,

October 2c, 1936. SeriaLNo. 101,741 Germany November 1, 1935 12 Claims. (CI. 60-54) each working circuit, may with the new arrangement be uniformly distributed round the periphery of the fluid circuit. able with a very shallow design are so large that a rapid exhaust of the fluid is possible. This extremely shallow design of the peripherally situ ated control elements, which is possible only in consequence of the mode of construction in ac- The port areas availcordance with the inventiomhas the consequence that the over-all diameter of the whole transmitter circuit is minimized. Various constructional examples of the invention are shown diagrammatially in the accompanying drawings, in which: Fig. 1' is a section of part of a hydraulic circuit, showing the ,control parts.

Fig. 2 is a cross section through a modified form of hydraulic turbo transmitter with a'dif- 'i'erent construction of shut-ofi parts.

Fig. 3 is a view similar to Figure 2, but showing another modification employing tubular ports adapted to be closed by a flexible ring.

Fig. 4 is a view similar to Figure 2, but showing still another modification, wherein a bellowsoperated valve is arranged to closethe discharge ports, and 1 Flg. 5 is an enlarged, detail view of a portion of Figure 4.

In Fig. /1 ports a lead from the working circuit chamber a to the atmosphere through the pressure chambers band the passagesb 6 Liquid is admitted from the inlet piper with its control values to the filling chamber "f (as shown in Fig.

2) and thence to the working circuit chamber a of the transmitter by way of the passages e, e

. leading .to the pressure chambers b. The latter of centrifugal force the working liquid admitted I to the pressure chambers b exerts on the sealing elementsd a pressure exceeding-that existing ini 1 a the circuit chamber a. The sealing elementsfld abut against annularv flatseatings g and hand thereby efiect a tight seal between the chamber a and the pressure chambers b. A small quantity of liquid flows back to the reservoir through regulating ports a, which is desired are adjustable. by. plugs 0 This returning liquid is renewed by the control pump during running, and the .sealing elements It remain in the closedposition.

When the transmitter is required to be put out of operation, the control pump is shut off or the admission of liquid is interrupted by closing the Figures 2, 3 and 4 and valve s so that liquid is no longer fed to the pres sure chambers 17. Thereupon the pressure acting inwardly on the sealing elements d falls and the higher pressure existing in the circuit chamber a raises these sealing elements (I from their seats a, h with the result that the contents of the working circuit of the transmitter can now escape through the openings a 12 and b. The sealing elements 11, which are preferably of thin sheet steel or other flexible material, seat tightly on the annular surfaces g and h. The main sealing rings g are so arranged that dirt cannot ordinarily stick on them, since during emptying of the circuit the working liquid flows over the exposed edges with high velocity. Should a particle of dirt remain attached to the annular seatings, this will be sure to be washed away during a subsequent emptying operation. A temporary slight lack of tightness between the circuit chamber a and the pressure chambers I) does not adversely aifect the normal operation of the hydraulic circuit, since the smaller leakage losses are made good by the control pump. Ring It prevents the sealing disks d from taking up a wrong position on their seats when they return. The sealing disks :1. are rendered accessible by easily removable plugs i. The emptying ports a are preferably formed in the driving part of the rotatable transmitter circuit, since this part in any case always rotates at the higher speed.

A further desirable constructional feature is the provision of an annular chamber e leading all round the circumference of the transmitter and from which the individual passages e debouch (Fig. 1), instead of separate passages e to each pressure chamber b (Fig. 2). In the embodiment shown in Figure 1, a filling chamber (not shown) is provided similar to that shown at f in similarly referred to herein. If desired, only one passage e communicates between the fllling chamber I and the annular chamber e. The control chambers b, I and e are preferably kept as small as possible, their total volume amounting'to not more than 5 per cent. of that of the circuit. Rapid emptying of the circuit is possible only when the control chambers are kept as small as possible, because the greater part of the liquid present in the control chambers must escape through the small ports 0 before the opening of the shut-off elements d.

Fig. 3 shows a modification of Fig. 2 wherein pressure fluid entering the control chamber b causes flexible sealing member (1 to close the outer ends ofthe outwardly projecting tubular members a and consequently to close the ports a In themodiflcation shown in Figures 4 and 5, the shut-off member consists of a bellows d limited in its motion by the screw d and having a head (1 adapted to close the port a The bellows d has a flexible corrugated cylindrical body the outer end of which is fixed to the body i and, as before, provided with a passage 0 therethrough. The admission of pressure fluid through the passage e expands the bellows d and causes the head It to prevent communication between the pressure chamber b and the exhaust passage b I claim:

1. In a hydraulic power transmitting device, a .working chamber, a driving rotor and a driven rotor therein, a plurality of ports leading out of said working chamber, a control chamber communicating with each of said ports, means for supplying pressure fluid to said chambers, and

. peripheral wall of said working aisaesc freely movable sealing laminae arranged to close said ports in response to the admissionof pressure fluid to said chambers.

2. In a hydraulic power transmittlm device. a working chamber, a driving rotor and a driven rotor therein, a plurality of ports leading out of said working chamber, a control chamber communicating witheach of said ports, means for supplying pressure fluid to said chambers, and relatively thin flexible sealing elements arranged to close said ports in response to the admission of pressure fluid to said chambers.

3. In a hydraulic power transmitting device, a working chamber, a driving rotor and a driven rotor therein, a plurality of ports leading out of said working chamber, a control chamber communicating with each said ports, means for supplying pressure fluid to said chambers, freely movable sealing laminae arranged to close said ports in response to the-admission of pressure fluid to said chambers, and outlet ports arranged in the wall of said chambers for releasing fluid therefrom.

4. In a hydraulic power transmitting device, a working chamber, a driving rotor and a driven rotor therein, a plurality of ports leading out of said working chamber, a control chamber communicating with each of said ports, means for supplying pressure fluid to said chambers, freely movable sealing laminae arranged to close said ports in response to the admission of pressure fluid to said chambers, and outlet ports arranged in the wall of said chambers for releasing fluid therefrom .independently of the open or closed podtion of said sealing laminae.

5. In a hydraulic power transmitting device, a working chamber, a driving rotor and a driven rotor therein, a plurality of ports leading out of said working chamber, a control chamber communicating with each of said ports, means for supplying pressure fluid to said chambers. freely movable sealing laminae arranged .to close said ports in response to the admission of pressure fluid to said chambers, outlet ports arranged in the wall of said chambers for releasing fluid therefrom independently of the open or closed position of said sealing laminae, and means for adjustably varying the openings or said control chamber outlet ports.

6. In a hydraulic power transmitting device, a'working chamber, a driving rotor and a driven rotor therein, a plurality of ports leading out of said working chamber, a control chamber communicating with eachof said ports, means for supplying pressure fluid to said chambers, and

freely movable sealing laminae arranged to close said ports in response to the admission of pressure fluid to said chambers, said working chamber outlet ports having tubular outlet members adapted to be engaged and closed by said sealing laminae.

7. In a hydraulic power transmitting device,

a working chamber, a driving rotor and a driven rotor therein, a, control chamber having a plurality. of sets of adiacently inlet and outlet ports, said inlet ports leading out of said working chamber means for supplying pressure fluid to said chambers, and freely movable sealing laminae, each laminae being arranged to close the inlet and outlet ports of a set thereof in response to the admission of prexure fluid to said chambers, said control chamber inlet ports being arranged in the chamber whereby into said control chamber,

to cause centrifugal force to eject the fluid there'- through.

8. In a hydraulic power transmitting device, a working chamber, a driving rotor and a driven rotor therein, a control chamber having a plurality of sets of adjacently disposed inlet and outlet ports, said inlet ports leading out ofsaid working chamber into said control chamber, means for supplying pressure fluid to' said chambers, and freely'movable sealing laminae, each laminae being arranged to close the inlet and outlet ports of a set thereof in response to the admission of pressure fluid to said chambers.

9. In a hydraulic power transmitting device, a working chamber, a drivingrotor and a driven rotor therein, a control chamber having a plurality of-sets of adjacently disposedinlet and outlet ports, said inlet ports leading out of said Working chamber into said control chamber, means for supplying pressure fluid to said chambers, and freely movable sealing laminae, each laminae being arranged to close the inlet and outlet ports of a set thereof substantially simultaneously in response to the admission of pressure fluid to said chambers,

10. In a hydraulic power transmitting device, a working chamber, a driving rotor and a driven rotor therein, a shaft connected to one of said rotors, a fluid reservoir adjacent said shaft, a control chamber having aninlet from said working chamber and, an outlet port adjacent said inlet port, said outlet port extending at least partially around said inlet port, a relatively thin sealing laminae responsive to the admission of pressure fluid to said control chamber to extend over and close said inlet and outlet ports, and

fluid-conducting means for connecting said reservoir to said control chamber.

11. In a hydraulic power-transmitting device, a working chamber, a driving rotor and a driven rotor therein, a fluid outlet port with a valve seat leading out of said working chamber, a control chamber communicating with said port, a control passageway for supplying pressure fluid to said control chamber, and a freely movable thin flexible sealing member movable into abutment with said valve seat to close said outlet port in response to the admission of pressure fluid to said control chamber, said control passageway opening into said control chamber on the opposite side of said sealing member from said working chamber.

12. In a hydraulic power-transmitting device, a working chamber, a driving rotor and a driven rotor therein, a fluid outlet port with a valve seat leading out of said working chamber, a control chamber communicating with said port, a control passageway for supplying pressure fluid to said control chamber,- and a freely movable thin flexible sealing member movable into abutment with said valve seat to close said outlet port in response to the admission of pressure fluid to said control member, said control passageway opening into saidcontrol chamber on the opposite side of said sealing member from said' working chamber, the area of said sealingmember exposed to the pressure fluid in said control chamber being greater than the area thereof exposed to said working chamber through said out.-

let port.

HANS FAIC CANAAN. 

